GEDCOM Viewer: System Requirements

GEDCOM Viewer(Android Edition) is designed for
mobile devices running the Android 2.2 operating system or a later version.
It is ideal for use on small tablet computers, but can be used on mobile
phones that have external storage ("SD Card") capability and a sufficient
amount of memory (RAM).
GEDCOM Viewer is very convenient to use on a device having, say,
a seven-inch screen of 800x480 pixels. It should be usable on devices
with smaller screens, though as the screen size decreases the formatting of
the information displayed is likely to be more cumbersome.

GEDCOM Viewer assumes that GEDCOM files to be displayed have been
downloaded by the user to the external storage medium.
GEDCOM Viewer also uses external storage to maintain a cache
of "map" files, which index the information in the GEDCOM files to speed
up access. In general, the map files are ten percent or less of the size of
the original GEDCOM files, and the amount of storage used for the cache of
map files is configurable by the user.

GEDCOM Viewer is designed to try to use as little RAM as possible,
but as a rough rule of thumb you should expect that the application will
actively use about 1K of RAM ("heap") for each individual in the GEDCOM
being displayed.
So, for example, a GEDCOM file containing information on 10,000 individuals
would consume about 10MB of RAM while it is actively being displayed.
The amount of RAM you have available on your device is likely to be the
limiting factor on how big a GEDCOM file you can display.
In tests on a small tablet equipped with a total of 512MB of RAM,
the application was easily able to display an 11MB GEDCOM file containing
information on over 13,000 individuals and 4,500 families, using a heap
size of about 16MB.
On devices with less RAM, or on which a lot of other applications are
active, the amount of RAM available to GEDCOM Viewer may be smaller,
which will effectively limit the size of the GEDCOM files that can be displayed.